A place like the Right Livers' Rest was bound to draw freaks, same as molasses draws flies. 1935, George Goodchild, chapter 5, in Death on the Centre Court: By one o'clock the place was choc-a-bloc.
Swallowing certain types of poisons may cause excessive salivation. According to the National Library of Medicine, pesticides can cause excessive saliva when they are swallowed. Venom from snake bites or insect stings is another type of poisoning that can cause the malady.
Expert: Dr. D. Evans replied 7 years ago. Saliva being foamy means that not enough water is present in the saliva. Saliva contains mucoproteins and glycoproteins, when there is not enough water, this can cause foaminess. The most likely cause is simply that you are dehydrated and not taking enough water.